| coldhearted(adjective, detached, impassive, unresponsive, laid-back) |
| composed(adjective, calm, close, quiet, gentle) |
| conservative(calm, quiet, reasonable, mild, controlled) |
| cool cat(expression, adjective, cool, detached, blank) |
| corked up(expression, calm, quiet, reasonable, mild) |
| deadpan(adjective, calm, dull, cool, flat) |
| flat(adjective, calm, dull, cool, detached) |
| forbidding |
| formal(adjective, close, quiet, gentle, mild) |
| going with the flow(expression, adjective, idiom, detached, impassive) |
| hard-boiled(adjective, detached, impassive, unresponsive, laid-back) |
| ice-cold |
| immovable(adjective, cool, detached, blank, sober) |
| imperturbable(adjective, cool, unfriendly, aloof, distant) |
| in charge(expression, calm, quiet, reasonable, mild) |
| in check(expression, calm, quiet, reasonable, mild) |
| in cold blood(expression, adjective, idiom, cool, detached) |
| inaccessible |
| incontestable |
| incontrovertible |